Verified Answer :

HomertheGenius

If one of the exterior angles of a triangle is acute, then the related interior angle must be obtuse.
    Answer: The triangle must be C ) obtuse.

Answer:  Third option is correct.

Step-by-step explanation:

If one of the exterior angles of a triangle is acute then,

By using the rule of "Linear Pair" we can find the interior angle

Let the exterior angle be

\(80\textdegree\)

So, its interior angle be

\(180-80=100\textdegree\)

So, our triangle become obtuse triangle .

So, we can take any measure of acute angle , always we get an obtuse angle .

Hence, Third option is correct.

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